显式专注于非命名空间范围错误...急需帮助 [英] Explicit specialization in non-namespace scope error... Desperately need help

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问题描述

有人可以帮我将以下代码移植到 GCC 中吗?我在这个网站上发现了很多或相关的问题,但我似乎无法应用在我的案例中建议的解决方法......

  typedef float MyData __attribute__((__vector_size__(16))); 

模板< typename T> class Data_T
{
public:
template< typename U> static bool IsEqual(const T& a,const T& b)
{
return a == b;
}

//修正:模板<>静态布尔IsEqual< MyData> (const MyData& a,const MyData& b)
static bool IsEqual(const MyData& a,const MyData& b)
{
return true;


$ TriggerProblem(const T& val)
{
if(!IsEqual(1.0f,val))//错误:调用'Data_T< float> :: IsEqual(float,const float&)'
{

}
}
};

触发问题的代码:

  Data_T<迈德特>研究所; 
inst.TriggerProblem(1.0f);

我得到一个错误错误:非命名空间范围'class Data_T' ,这是由专门化函数 IsEqual()引起的,但现在遇到了另一种类型的错误(没有用于调用'Data_T :: IsEqual(float,const float& )'),这似乎是由我无法删除的 __ vector_size __ 属性造成的。请帮助...

解决方案

在这种情况下,重载应该足以代替专门化:

 模板< typename T> class Data_T 
{
public:
template< typename U> static bool IsEqual(const U& a,const U& b)
{
return a == b;


static bool IsEqual(const MyData& a,const MyData& b)
{
return MyDataTypeIsEqual(a,b);
}

模板< typename U> bool IsRangeEqual(const U& a,const U& b,const U& delta)
{
return(a> = b)? (a-b≤Δ):(b-a≤Δ);


bool IsRangeEqual(const MyData& a,常量MyData& b,常量MyData&准确度)
{
return MyDataTypeIsRangeEqual(a,b,准确性);
}
};

编辑关于更新

float float __vector __ 的转换已失败,您似乎有一个错字:

 模板< typename U> static bool IsEqual(const T& a,const T& b)

vs .:

 模板< typename U> static bool IsEqual(const U& a,const U& b)

我相应地修正了上面的代码。

Can somebody please help me to port the following code to GCC? I have found a lot or related questions on this site, but I just can't seem to apply suggested workarounds in my case...

typedef float MyData __attribute__ ((__vector_size__ (16)));

template <typename T> class Data_T
{
    public:
    template < typename U > static bool IsEqual (const T & a, const T & b)
    {
        return a == b;
    }

    //Fixed: template <> static bool IsEqual < MyData > ( const MyData & a, const MyData & b)
    static bool IsEqual ( const MyData & a, const MyData & b)
    {
        return true;
    }

    void TriggerProblem(const T & val)
    {
        if (!IsEqual(1.0f, val)) // Error: no matching function for call to 'Data_T<float>::IsEqual(float, const float&)'
        {

        }
    }
};

The code to trigger the problem:

Data_T<MyData> inst;
inst.TriggerProblem(1.0f);

I was getting an error error: explicit specialization in non-namespace scope 'class Data_T', which was caused by specialization function IsEqual(), but now encountered another type of error (no matching function for call to 'Data_T::IsEqual(float, const float&)'), which seems to be caused by the __vector_size__ attribute, which I can't remove. Please help...

解决方案

In this case overloading should suffice instead of specializing:

template <typename T> class Data_T
{
public:
    template<typename U> static bool IsEqual(const U& a, const U& b)
    {
        return a == b;
    }

    static bool IsEqual(const MyData& a, const MyData& b)
    {
        return MyDataTypeIsEqual (a, b);
    }

    template<typename U> bool IsRangeEqual(const U& a, const U& b, const U& delta)
    {
        return  (a >= b) ? (a - b <= delta) : (b - a <= delta);
    }

    bool IsRangeEqual(const MyData & a, const MyData & b, const MyData & accuracy)
    {
        return MyDataTypeIsRangeEqual (a, b, accuracy);
    }
};

Edit regarding update:
While for me the conversion from float to float __vector__ already fails, you seem to have a typo of:

template<typename U> static bool IsEqual(const T& a, const T& b)

vs.:

template<typename U> static bool IsEqual(const U& a, const U& b)

I fixed the above code accordingly.

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